In 1725 a counting and registration of the entire Seigneurie of La Bouteillerie was conducted. The following is extracted from this census:^{Bergeron p161}

1. Widow Hudon, has 14 acres, neighbor
2. Next is Francois Duplessis (Sirois) who owns 6 acres frontage times 42 acres deep, is taxed 3 Livres and 3 Chapons rent and 6 sols de cen. His land consists of a house, a barn, a stable, and 25 acres of tillable land and 8 acres of prairie land. (Total tax $13.90). 
3. Next neighbor was Francois Boucher.

This confirms that Francois did own the concession made originally to Jacques Thiboutot .  From the dowry he gave to his bride Marie Anne and his land purchases, we learn that Francois was doing reasonably well economically. In addition to farming he most likely participated in the booming porpoise fishery of the area. 

The following is borrowed from Alfred Bergeron^{Bergeron p159-161}:

Earlier, during the, 1640's, a man could clear between one and two acres per year. In the 1720's, a man could clear between three and four acres per year with the aide of an ox and pick. Our ancestor[Francois] paid 1/20th of his farm's cash flow for a "casual tax." Consider 1/11th of the fish he caught was considered taxes. These he paid to the Seigneurie. Added to this, Francois had to pay 1/12thof the profit from the sale whenever he bought more land.

In 1720, a man had to work for 1 or 2 days to obtain a single pick or shovel valued at 40 sols or 2 Livres. A long gun was valued at 10 Livres, which represented between 4 to 6 days of hard labor; one large ox equaled 8 Livres; and 4 used bedsheets were valued at 14 Livres or a total of 5 to 7 days of hard labor … if these objects were even available.

In [Francois'] day agriculture was very favorable. A man planted enough wheat to provide about twelve bushels of ground wheat per person in his household, and an additional two bushels per person to sell which gave him a cash flow. Expenses would be mostly to pay taxes and to replenish or add new implements for the farm, especially iron tools, a stove imported from Boston, or cookware. Annual pew rental at church was about 1 1/2 bushels of wheat.  [At this time], this tiny river community had nothing spectacular to offer. Rivière Ouelle was far from the attractions of city life and high society. It was far from political and military centers; it was far from centers that governed trade and commerce.

There were at Rivière Ouelle two very prominent fishing companies who specialized in catching porpoises. Fishing for porpoises was important to the city of Quebec because it represented about 13% of Quebec's [the city's] daily consumption. It was excellent seafood and it was especially useful for its oil used in lamps. Fleets to and from Quebec,  Île d'Orléans, Rivière Ouelle and Kamouraska traveled daily for this specialized industry. We can assume that our ancestor, who lived on the waters' edge, was involved in this profitable business. 

Rivière Ouelle was not a place to prosper, but most colonists survived. They knew that they had to make it on their own and they were motivated to do so. 

As Francois prospered economically his family began to grow as well. At the time of his marriage in 1713 his family consisted of: